CoN_(x)C active sites-rich three-dimensional porous carbon nanofibers network derived from bacterial cellulose and bimetal-ZIFs as efficient multifunctional electrocatalyst for rechargeable Zn–air batteries

查看全文 作　　者：Wenming [1]Zhang;Jingjing [1]Chu;Shifeng [1]Li;Yanan [1]Li;Ling [1]Li

机构地区：[1]National-Local Joint Engineering Laboratory of New Energy Photoelectric Devices,College of Physics Science and Technology,Hebei University,Baoding 071002,Hebei,China

出　　处：《Journal of Energy Chemistry》索引2020年第29卷第12期,共10页

基　　金：financial support from the following sources: the National Natural Science Foundation of China (NSFC) (Grants 51607054, 51772073);Young Talent of Hebei Province (Nos. 70280011808, 70280016160250);Hebei Province Outstanding Youth Fund (A2018201019, A2017201082);Hebei Province Natural Science Fund (A2015201050)。 摘　　要：In this work, a CoNxC active sites-rich three-dimensional porous carbon nanofibers network derived from bacterial cellulose and bimetal-ZIFs is prepared via a nucleation growth strategy and a pyrolysis process.The material displays excellent electrocatalytic activity for the oxygen reduction reaction, reaching a high limiting diffusion current density of -7.8 mA cm^(-2), outperforming metal–organic frameworks derived multifunctional electrocatalysts, and oxygen evolution reaction and hydrogen evolution reaction with low overpotentials of 380 and 107 mV, respectively. When the electrochemical properties are further evaluated, the electrocatalyst as an air cathode for Zn-air batteries exhibits a high cycling stability for63 h as well as a maximum power density of 308 mW cm^(-2), which is better than those for most Zn-air batteries reported to date. In addition, a power density of 152 mW cm^(-2) is provided by the solid-state Zn-air batteries, and the cycling stability is outstanding for 24 h. The remarkable electrocatalytic properties are attributed to the synergistic effect of the 3 D porous carbon nanofibers network and abundant inserted CoNxC active sites, which enable the fast transmission of ions and mass and simultaneously provide a large contact area for the electrode/electrolyte. 关键词：Bacterial cellulose Bimetal-ZIFs CoNxC active sites 3D nitrogen-doped porous carbon nanofiber Zn-air batteries

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CoN_(x)C active sites-rich three-dimensional porous carbon nanofibers network derived from bacterial cellulose and bimetal-ZIFs as efficient multifunctional electrocatalyst for rechargeable Zn–air batteries

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